Figure 3. Pro-inflammatory cytokines and TLR ligands promote the emigration of LY6Chi monocytes from the bone marrow.

Monocyte emigration from the bone marrow during the early stage of infection with Listeria monocytogenes is normal in mice that lack either myeloid differentiation primary response protein 88 (MYD88; which is required for most responses to Toll-like receptor (TLR) ligands) or the type I interferon receptor (IFNAR). However, the combined loss of MYD88 and IFNAR impairs monocyte emigration from the bone marrow. IFN, interferon.